Category: STORAGE
Linux Reclaim Storage Space : Ext4 Unmap Feature
Its been long time reclaiming space on a block level storage , been alerting and frustrating for all who work on storage side. Block storage only knows about areas of a volume that have ever been written . If later the application frees up space / delete files , the space is not marked as [...]
HowTo : Setup Iscsi Initiator Equallogic Target On Linux
We are using Dell Equallogic HIT/KIT 1.2.0 version to configure iscsi target on CentOS 6.2. You can download and install the host integration tool from equallogic website. Query host kit installation [root@centos /]# rpm -qa | grep -i equ equallogic-host-tools-1.2.0-1.epa.el6.x86_64 [root@centos /]# Check ehcmd process status [root@rhel62-eql /]# ps -ef | grep -i eh root [...]
How To Configure Iscsi Storage On Redhat Linux
Here I am trying to explain Equallogic Lun configuration on Redhat Linux 5 version. Linux Iscsi Storage Lun Mapping is much simpler on Equallogic Storage Array. Free Open Isci tool is used as the iscsi initiator. Once installed you can use iscsiadm command to configure the Lun. Dell recommends to configure iscsi on redhat 5 [...]
How To Scan/Detect New Luns In Redhat Linux & Outputs To Remember
You use the below commands to identify existing LUNS and How to add newly mapped LUNS to Linux. Check the current attached disks #cat /proc/scsi/scsi | egrep -i ‘Host:’ | wc -l #fdisk -l 2>/dev/null | egrep ‘^Disk’ | egrep -v ‘dm-’ | wc -l Check current multipath setup using multipath or powermt command # [...]
How To Check LUN or SAN Disk In Linux
#cat /proc/scsi/scsi file it wi give you information like below Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: HP 36.4G Model: MAN3367MC Rev: HP05 Type: Direct-Access ANSI SCSI revision: 02 Host: scsi2 Channel: 00 Id: 00 Lun: 00 Vendor: COMPAQ Model: HSV110 (C)COMPAQ Rev: 2003 Type: Unknown ANSI SCSI revision: 02 Host: [...]
